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  4. Home Windows: Open or Closed for Indoor Air Quality?
  • It’s Beautiful Outside: Should Your Home Windows be Open or Closed for Optimal Indoor Air Quality?

    Don’t just cool things down—improve indoor air quality with a smarter ventilation strategy.

    Sliding Door

    • Did you know most of us spend up to 90% of our day indoors?1 That staggering stat amplifies the importance of good indoor air quality at home and may have you wondering how to let more fresh air in.

      But don’t go flinging open all the windows at home just yet. Finding the right ventilation strategy is a little more complex than that.

      Use these helpful tips to make smart indoor air quality choices about when to let the breezes blow and when to crank up the central air for relief from the heat.

    Keep windows closed if you have seasonal allergies, the outside air is humid, or local smog or wildfire smoke levels are high.

    • Keep windows closed and cool your home with air conditioning if:

      • You have seasonal allergies. Many people with sensitive sinuses fare better in a dry, air-conditioned environment that shuts out pollen and dust.
      • The outside air is humid. Humidity can amp up the negative effects of both indoor irritants and outdoor particles that find their way inside. Humidity also creates the perfect breeding ground for dust mites, a big allergy trigger for many people.
      • Local smog or wildfire smoke levels are high. Even with closed windows and doors, you’ll want to rely on a heavy-duty air filtration system to trap the harmful particles that can slip through the cracks.

      Open windows for natural ventilation if:

      • Your home has mold or other fungus problems. A compromised central air handling system can be a free-for-all for mold, mildew and other biological contaminants. Open home windows if you notice musty, smelly or stuffy indoor air. To boost your efforts, find an in-home air filtration unit designed to target and trap the specific pollutants in your building or area.
      • Things are getting steamy. Especially in smaller home spaces or those with poor ventilation, a little indoor moisture (from showers or stovetop cooking) goes a long way in creating the kind of humidity dust mites love.
      • You’ve made recent home improvements. Construction materials and paint are notorious for “off-gassing” the chemicals in their adhesives and active compounds. The effects of this process can be dangerous for indoor air quality, especially right after installation. Confirm each product’s safety instructions, and wait as long as possible (days or even weeks) before closing up home windows.


      1. Environmental Protection Agency

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